From the new 16.12.1 drivers:
Added support for AMD Radeon R9 Fury series, R9 390 series, R9 380 series, R9 290 series, R9 285, R9 260 series, R7 360, and R7 260 desktop graphics products
yeah, I know that. In particular I'm interested in support for custom aftermarket cards. Even before WattMan supported the rx480, but it did not support the MSI rx480 Gaming.